Anti-solar polymers and copolymers from vinyloxycarbonyl-methyl 4-N,N-dimethylamino benzoate and vinyloxycarbonyl-methyl-4-methoxy cinnamate monomeas, method of making the same and cosmetic compositions containing the same

ABSTRACT

An anti-solar polymer has in the macromolecular chain thereof at least one unit of the formula ##EQU1## wherein F is a residue derived from an aromatic compound imparting to the polymer the ability to absorb wave lengths of light in the range of about 280-315 millimicrons. The polymer is employed in a cosmetic composition.

The present invention relates to novel "anti-solar" polymers which are particularly useful in cosmetic preparations, to the process for preparing these new polymers and to cosmetic compositions containing the same.

Sunburn, or erythema, results from the excessive exposure of human skin to the rays of the sun and the wave lengths of light in the range of 280 to 315 millimicrons, often called the "erythematous zone" are those which produce such sunburn.

Below this wave length range the sun rays do not present any particular danger, for they are filtered by the ozone in the atmosphere.

However, the UV rays which are responsible for or which produce a desirable suntan are those in the zone ranging from 315 to 400 millimicrons.

Consequently, if one desires to be exposed to solar radiation, it is important that the skin be protected with the aid of a composition containing a substance which absorbs the UV rays in the erythematous zone, thereby avoiding an undesirable sunburn, which composition however also transmits those wave lengths in the range of 315 to 400 millimicrons so as to obtain a desirable suntan.

Heretofore a number of formulations have been proposed for this purpose. For the most part, they are based on aromatic compounds exhibiting an absorption in the UV in the zone between 280 and 315 millimicrons and, more particularly, between 295 and 305 millimicrons.

In addition to this absorbing power, such compounds must have other properties and in particular they must not absorb the wave lengths of light in the zone ranging from 315 to 400 millimicrons, they should be non-volatile and they should also be resistant to both fresh and salt water and to perspiration. Additionally they should exhibit cosmetic compatibility with other components which may be present in suntan formulations and they should be non-odorous, non-toxic and non-irritating, i.e. entirely harmless to the user.

Among these characteristics, non-toxicity and dermotological compatibility are of great importance.

Representative aromatic compounds which have heretofore been employed in suntan preparations include derivatives of para-aminobenzoic acid, derivatives of anthranilic acid, derivatives of annamic acid and dihydroxy and trihydroxy cinnamic acid, derivatives of coumarin and the like.

The rather current widespread use of such compounds as an "anti-solar filter", is not without certain disadvantages. Certain of these substances do not exhibit sufficient efficiency in their ability to absorb the wave lengths of light in the erythematous zone. Moreover many do not possess the requisite solubility characteristics necessary so as to be utilized in many different types of formulation, and finally, because of their low molecular weight, many are able to penetrate through the epidermis of the skin into the human body which, in certain cases, can cause unfavorable side effects.

In an effort to remedy the inconveniences of these compounds, it has also been proposed to fix on macromolecular chains of certain copolymers, filters absorbing in UV in the erythematous region.

Among the polymers of this type described in the literature, one can in particular cite those resulting from the polymerization of 2-hydroxy (3-acryloxy or methacryloxy-2 hydroxy-4-propoxy) benzophenone with a comonomer of the methyl methacrylate type or of an unsaturated carboxylic acid such as acrylic, methacrylic, itaconic or crotonic acid, or the like.

However, these copolymers have not been found to be fully effective in cosmetic compositions because often they are quite difficult to formulate with other components generally found in a wide variety of anti-solar compositions and often they absorb only a portion of the undesirable wave lengths in the erythematous zone.

In effect, the nature of the function which permits the linking of the filter moiety to the polymeric chain of these known materials seriously limits the number of aromatic residues which impart the filtering or absorping characteristics to the polymer and thus it has been found that there is often not a sufficient amount of such aromatic residues to provide the degree of efficacy desired or required.

To overcome these disadvantages, the applicants have now provided anti-solar polymers wherein the residue which imparts to the polymer the ability to absorb wave lengths in the erythematous zone is linked to the polymeric chain by an intermediate chemical function of a particular type.

Thus, the present invention relates to an anti-solar polymer which contains in the macromolecular chain thereof at least one unit having the formula ##STR1## wherein F is a residue derived from an aromatic compound imparting to the polymer the ability to absorb those wave lengths of light in the range of about 280 and 315 millimicrons.

It has been observed that the use of the anti-solar polymers of the present invention in cosmetic compositions is highly advantageous since the linking of the aromatic residue to the macromolecular chain avoids or at least significantly retards the migration of an otherwise non-linked absorbent moiety through the skin into the human body thereby avoiding any undesirable side effects which have been experienced in the use of heretofore known anti-solar filters.

The importance of this feature can be easily appreciated especially since repeated applications of the anti-solar compositions of this invention are generally not necessary to achieve the desired results which thereby avoids any substantial risk of a massive absorption of the filter compounds into the body.

The anti-solar polymers of this invention generally have an average molecular weight generally between 2000 and 1,000,000 and the radical represented by F can be derived from a variety of aromatic compounds. Representative radicals include aryl, alkyl aryl, alkenylaryl, each of which can optionally be substituted, as well as aromatic heterocylic radicals, also optionally substituted.

In particular the radical F can be selected from the group consisting of: ##SPC1##

wherein R₁ and R₂ represent alkyl having 1-3 carbon atoms; ##SPC2##

wherein R₃ represents hydrogen or methoxy; ##SPC3##

wherein R₄ represents -- S -- CF₃ or --CF₃, ##SPC4## ##SPC5## ##SPC6## ##SPC7##

wherein R₄ has the meaning given above, ##SPC8##

Because of the variety of the nature of the aromatic radicals that can be linked to the polymer chain, it is possible to fully cover the erythematous zone simply by a judicious selection of the appropriate aromatic compound to be linked to said polymer chain.

The anti-solar polymers of the present invention can be either homopolymers or copolymers.

Thus, in the homopolymers of this invention, in the repeating unit defined by formula I, the values of F are the same whereas in the copolymers of this invention, in the said repeating unit, the values of F are different.

The ability to obtain copolymers having fixed on their macromolecular chains aromatic radicals of differing structures is a highly desirable feature since by choosing the appropriate aromatic compounds, it is thus possible to provide a single copolymer which can cover the entire erythematous zone, thereby producing an anti-solar filter of great efficacy.

The polymers of the invention can also be tripolymers, terpolymers or the like, and they can include, at the same time, units of formula I wherein F is the same or different, and one or more other units can be derived from ethylenically unsaturated monomers.

The selection of the ethylenically unsaturated monomers or comonomers for use in the production of the polymers of the present invention is generally dependent on the function of the desired use of the resulting composition or, more exactly, on the type of formulation that is desired.

Thus it is possible to impart to the anti-solar polymers of this invention different characteristics by varying the nature of the comonomer used.

Representative comonomers include:

a. N-vinylpyrrolidone,

b. N-methacryloyl D-glucosamine,

c. dimethylaminoethyl methacrylate

d. stearyl methacrylate

e. stearyl acrylate and

f. vinyl stearate

The first three of these comonomers generally increase the solubility of the resulting polymer in aqueous solutions while the last three ordinarily increase the solubility of the polymer in oil.

Copolymers of the present invention can have the formula ##STR2## wherein F has the meaning given above,

R¹ represents hydrogen or methyl and

Y represents a radical selected from the group consisting of ##SPC9## ##STR3## wherein X represents D-glucosamine, dimethylamino ethyl optionally quaternized and C₁₈ H₃₇, and ##STR4##

The amount of the comonomer present in the anti-solar polymer of the present invention is variable but it is generally between about 20 and 90% of the total weight of the polymer.

This latter content, as can be seen, can vary rather widely and the particular content selected can depend, for instance, on the particular use chosen for the resulting polymer.

The present invention also relates to a process for preparing the said anti-solar polymers.

These polymers can be prepared according to two distinct processes.

1. The first process comprises homopolymerizing or copolymerizing in a first stage one or more comonomers with a monomer of the formula ##STR5## wherein X is a halogen, and in a second stage, reacting the thus formed homopolymer or copolymer with at least one alkaline salt of an aromatic compound of the formula ##STR6## wherein F has the same meaning given above, in amounts corresponding to the desired polymer.

2. The second process comprises preparing in a first stage a monomer, designated a "solar-filter monomer", of the formula ##STR7## wherein F has the same meaning given above, this said monomer in a second stage then being homopolymerized or copolymerized with one or more other comonomers.

In these two processes, the polymerization reactions are identical and can be effected according to conventional polymerization reactions, i.e. in mass, in solution, in suspension or in emulsion.

The polymerization initiators utilized are generally conventional free radical polymerization initiators and the choice of any one particular initiator can depend principally on the different monomers used as well as on the nature of reaction medium selected.

Representative usable initiators include the peroxides, such as benzoyl peroxide, lauroyl peroxide, acetyl peroxide, tertiobutyl hydroperoxide or benzoyl hydroperoxide, a catalyst which by decomposition liberates an inert gas, such as azobisisobutyonitrile, an oxidation-reduction catalyst such as sodium persulfate, sodium sulfite and H₂ O₂. The concentration of the initiator is generally between about 0.2 - 35 weight percent, preferably between 0.5 - 20 weight percent, of the total weight of the monomer content.

The molecular weight of the anti-solar polymers of the present invention can be regulated by introducing, during the course of polymerization reaction, small amounts, i.e. about 0.05 - 0.15 weight percent of a chain regulating agent such as an aldehyde, for instance, butyraldehyde or a halogenated substance such as chloroform, bromoform, carbon tetrachloride, and the like.

At the end of the polymerization reaction, the polymer obtained can, if desired, be purified by, for example, treating it with an ion exchange resin.

The present invention also relates to an anti-solar cosmetic composition containing as the active component for absorbing wave length of light in the range of 280 to 315 millimicrons at least one anti-solar polymer as described above.

These cosmetic compositions can be present in diverse forms, the choice of any particular form being dependent upon the desired use of the composition. Preferably, these compositions are present in the form of an aqueous emulsion, lotion, cream, milk, gel or in the form of an aerosol. These compositions can also be present in the form of an aqueous or hydroalcoholic (ethanol or isopropanol) solution or even in the form of an oily solution.

When the compositions of the present invention are present in the form of an aerosol, they are packaged under pressure in a conventional aerosol bomb or container in the presence of a propellant gas which is preferably a halogenated hydrocarbon or a mixture of said hydrocarbons, such as, for example, mixtures of trichlorofluoromethane and dichlorodifluoromethane.

In these cosmetic compositions, the concentration of the polymers described above can be varied for any particular concentration can depend on the degree of protection desired. However, the concentration of the anti-solar polymer in these compositions is generally between about 0.2 - 20% by weight of the total composition.

These anti-solar cosmetic compositions can also contain conventional cosmetic adjuvants such as fatty bodies (oils, fats and waxes), emulsifying agents, surfactants, perfumes, silicone oils, pigments, dyes or preservatives.

The incorporation into these compositions of colored pigments also permits coloring the skin and masking skin flaws.

By applying to the skin the composition of the present invention, there is formed a film exhibiting good affinity vis-a-vis the epidermis, thus assuring excellent protection against wave lengths of light in the erythematous zone.

The present anti-solar polymers have been found to be non-toxic and their excellent protective action is 2-3 times greater than achieved by the same aromatic compound but which is not fixed to a polymer.

In addition to this protective action of the skin vis-a-vis solar rays, the polymers of the present invention can also be used to protect, against degradation, dyes contained in various cosmetic formulations such as for example a hair dye composition, a hair tinting composition and the like.

The following examples are given to illustrate the present invention.

EXAMPLE 1

Preparation of vinyloxycarbonylmethyl cinnamate of the formula: ##SPC10##

Into a 500 ml flask provided with a condenser, a nitrogen lead in tube and an agitator, there are introduced 4.8 g of sodium hydride (50% suspension in oil) and 50 of dimethyl formamide. To this resulting mixture, there areslowly introduced 14.8 g of cinnamic acid in 50 ml of dimethylformamide.

The reaction is exothermic and the temperature is maintained at 40° C by cooling.

The mixture is left to stand for 24 hours at ambient temperature. Then there are introduced 12 g of vinyl chloroacetate. The resulting solution is stirred for 24 hours at ambient temperature.

Sulfuric ether is then added and the organic layer is washed several times with water.

After drying and evaporation, the resulting residue is recrystallized in petroleum ether, yielding 14 g of pure product.

Melting point = 60° C

λ_(max) ^(MeOH) = 277 millimicrons

EXAMPLE 2

Preparation of copolymer of vinyloxycarbonylmethyl cinnamate/stearyl methacrylate (Process 2)

2 g of vinyloxycarbonylmethyl cinnamate prepared according to Example 1 arecopolymerized with 1 g of stearyl methacrylate in solution in 2 g of acetone, in the presence of 0.3 g of azobis-isobutyronitrile.

The polymer is precipitated in sulfuric ether, yielding 1 g of pure polymer.

λ_(max) ^(Hexane) = 275 millimicrons K_(sp) = 9,500

EXAMPLE 3

Preparation of a copolymer of vinyloxycarbonylmethyl/vinyl stearate (Process 1).

Into a 500 ml flask provided with a condenser, a nitrogen lead in tube and an agitator and containing 4.8 g of sodium hydride (50% suspension in oil)and 100 g of dimethylformamide, there is slowly introduced a solution of 14.8 g of cinnamic acid in solution in 50 g of dimethylformamide.

The resulting mixture is agitated, initially, for 2 hours at ambient temperature and then for 4 hours at 50° C. Thereafter, 40 g of a copolymer composed of 30% vinylchloroacetate and 70% vinyl stearate (MW = 40,000) are added.

The resulting mixture is agitated overnight at 140° C, after which it is filtered, concentrated and taken up in benzene.

After filtering, the polymer is precipitated in methanol, yielding 45 g of pure polymer.

λ_(max) ^(Hexane) = 274 millimicrons K_(sp) = 30,400

EXAMPLE 4

Preparation of a copolymer of vinyloxycarbonylmethyl/dimethylaminoethyl methacrylate (Process 2).

2 g of vinyloxycarbonyl methyl cinnamate, prepared in accordance with Example 1, are copolymerized with 1 g of dimethylaminoethyl methacrylate in solution in 6 g of dioxane, in the presence of 0.3 g of azobis-isobutyronitrile.

The resulting solution is agitated for 24 hours at 80° C. There is then introduced 1 g of dimethyl sulfate in solution in 48 g of methanol.

The temperature is maintained for 4 hours at 80° C, and the polymer is then precipitated in ethyl acetate, yielding 1.3 g of pure polymer.

λ_(max) ^(EtOH) - H.sbsp.2O = 276 millimicrons K_(sp) = 9,000

EXAMPLE 5

Preparation of a copolymer of vinyloxycarbonylmethyl 4-methoxy cinnamate/vinyl stearate (Process 1).

Into a 500 ml flask provided with a condenser, a nitrogen lead in tube and an agitator, and containing 88 g of sodium hydride in a 50% suspension in oil and 100 g of dimethylformamide, there are slowly introduced 18 g of 4-methoxy cinnamic acid in solution in 70 ml of dimethylformamide.

The resulting mixture is agitated initially for 24 hours at ambient temperature and then at 140° C for 8 hours. There are then introduced 40 g of a copolymer composed of 30% vinyl chloroacetate and 70%vinyl stearate (MW = 40,000) in solution in 100 ml of dimethylformamide. The mixture is agitated at 140° C for 15 hours after which the polymer is precipitated in 2 liters of water, taken up in hot benzene, filtered and precipitated in methanol, yielding 40 g of pure polymer.

λ_(max) 1^(Hexane) = 298 millimicrons K_(sp) = 37,000

λ_(max) 2^(Hexane) = 306 millimicrons K_(sp) = 37,000

EXAMPLE 6

Preparation of a copolymer of vinyloxycarbonylmethyl 4-methoxy cinnamate/dimethylaminoethyl methacrylate quaterinized with dimethyl sulfate (Process 1).

The same quantity of solution of sodium 4-methoxy cinnamate, prepared in Example 5, is poured into a flask containing 40 g of a copolymer composed of 30% vinyl chloroacetate and 70% dimethylaminoethyl methacrylate quaternized with dimethyl sulfate (MW = 50,000) in solution in 100 ml of dimethylformamide.

The resulting mixture is agitated at 140° C for 15 hours, after which the polymer is precipitated in petroleum ether, yielding 25 g of pure polymer.

λ_(max) 1^(EtOH) - H.sbsp.2O = 298 millicron K_(sp) = 32,000

λ_(max) 2^(EtOH) - H.sbsp.2O = 306 millimicrons K_(sp) = 32,000

EXAMPLE 7

Preparation of vinyloxycarbonylmethyl-4-N,N-dimethylamino benzoate of the formula ##SPC11##

Into a 125 ml reactor provided with a condenser, a nitrogen lead in tube and an agitator and containing 1.66 g of sodium hydride (50% suspension inoil) and 20 g of dimethylformamide, there is introduced, little by little, a solution of 6.6 g of 4-N,N-dimethylamino benzoic acid in solution in 30 g of dimethylformamide while maintaining the temperature at 30° C by cooling the same.

The solution is left to stand with stirring for 12 hours. Then there are introduced 4.8 g of vinyl chloroacetate and the mixture is left to stand for 12 hours at ambient temperature.

The solution is poured into water and the resulting precipitate is filteredand dried under reduced pressure. After recrystallization in methanol, 4.8 g of pure product are obtained.

Melting point = 80° C

λ_(max) ^(EtOH) = 313 millimicrons

EXAMPLE 8

Preparation of a copolymer of vinyloxy carbonylmethyl-4-N,N-dimethylamino benzoate, 2.5 g of stearyl methacrylate, 0.25 g of azobis-isobutyronitrileand 12 ml of benzene.

The solution is heated for 16 hours at C, then poured into 800 ml of a 50:50 mixture of ethanol and methanol, yielding 2 g of pure product.

λ_(max) ^(CHCl).sbsp.3 = 311 millimicrons K_(sp) = 20,400

EXAMPLE 9

Preparation of a copolymer of vinyloxycarbonylmethyl-4-N,N-dimethylamino benzoate/N-vinylpyrrolidone (Process 1).

Into a 100 ml flask provided with a condenser, a nitrogen lead in tube and an agitator and containing 1.66 g of sodium hydride (50% suspension in oil) and 20 g of dimethylformamide, there is introduced, little by little,a solution of 6.6 g of 4-N,N-dimethylamino benzoic acid in solution in 30 ml of dimethylformamide while maintaining the temperature at 30° C,by cooling.

The solution is left to stand at rest for 12 hours. There are then introduced 10 g of a copolymer composed of 35% vinyl chloroacetate and 65%N-vinylpyrrolidone (MW = 40.000) in 50 ml of dimethylformamide.

The resulting solution is left to stand for 24 hours at 50° C after which it is poured into 2 liters of sulfuric ether. The resulting precipitate is filtered and then dried under reduced pressure, yielding 8 g of pure product. MW = 30,000.

λ_(max) ^(EtOH) = 312 mm K_(sp) = 41,000

EXAMPLE 10

Preparation of a copolymer of vinyloxycarbonylmethyl-4-N,N-dimethylamino benzoate/vinyl stearate (Process 1).

Into a 100 ml flask provided with a condenser a nitrogen lead in tube and an agitator and containing 0.48 g of sodium hydride (50% suspension in oil) and 20 ml of dimethylformamide, there are introduced 1.65 g of 4-N,N-dimethylamino benzoic acid in solution in 20 ml of dimethylformamide.

The reaction is exothermic and the temperature is maintained at 40° C by cooling.

The resulting solution is agitated for 24 hours at ambient temperature after which there are introduced 4 g of a copolymer composed of 30% vinyl chloroacetate and 70% of vinyl stearate (MW = 40,000) in solution in 20 mlof dimethylformamide. The temperature is held at 100° C for 24 hoursand then the solution is poured into methanol.

The resulting precipitate, after filtration, is dried under reduced pressure, yielding 1.5 g of pure polymer.

λ_(max) ^(Hexane) = 303 millimicrons K_(sp) = 37,000

EXAMPLE 11

Preparation of a copolymer of vinyloxycarbonylmethyl 4-H,N-dimethylamino benzoate/dimethylaminoethyl methacrylate quaternized with dimethyl sulfate(Process 2).

2 g of vinyloxycarbonylmethyl 4-N,N-dimethyl benzoate, prepared according to Example 7, are copolymerized with 1 g of dimethylaminoethyl methacrylate in solution in 6 g of dioxane in the presence of 0.3 g of azobis-isobutyronitrile.

The resulting solution is agitated for 24 hours at 80° C. There is then introduced 1 g of dimethyl sulfate in solution in 4 g of methanol. The temperature is held at 80° C for 4 hours after which the polymer is precipitated in ethyl acetate, yielding 1.1 g of pure polymer.

λ_(max) ^(EtOH) - H.sbsp.2O = 313 millimicrons K_(sp) = 30,000

EXAMPLE 12

Preparation of vinyloxycarbonyl methyl salicylate of the formula ##SPC12##

Into a 250 ml flask provided with a condenser, a nitrogen lead in tube and an agitator, there are introduced 16 g of sodium salicylate, 12 g of vinylchloroacetate and 30 g of dimethylformamide.

The resulting solution is left to stand with agitation for 3 days at ambient temperature after which it is poured into chloroform.

After the addition of sulfuric ether thereto and after decanting the quaternized the etherified layers are separated and washed with water.

The ether is then distilled off to provide an oil which is purified by distillation (12 g).

Boiling point = 120°-124° C under 0.05 mm Hg

λ_(max) ^(MeOH) = 305 millimicrons

EXAMPLE 13

Preparation of a copolymer of vinyloxycarbonylmethyl salicylate/vinyl stearate (Process 2).

Into a 25 ml flask provided with a condenser, a nitrogen lead in tube and an agitator, there are introduced 2 g of vinyloxycarbonylmethyl salicylate, 1 g of vinyl stearate and 0.3 g of azobis-isobutyronitrile and6 ml of acetone.

The mixture is heated to reflux for 24 hours, after which it is poured intomethanol. The resulting precipitate is then filtered and dried, yielding 1.2 g of pure polymer.

λ_(max) ^(CHCl).sbsp.3 = 309 millimicrons K_(sp) = 11,300

EXAMPLE 14

Preparation of copolymer of vinyloxycarbonylmethyl salicylate/vinyl stearate (Process 1).

Into a 50 ml flask provided with a condenser, a nitrogen lead in tube and an agitator, there are introduced 1.6 g of sodium salicylate, 4 g of a copolymer composed of 30% vinylchloroacetate and 70% of vinyl stearate (MW = 40,000) and 20 g of dimethylformamide.

The temperature is held at 140° C for 15 hours, at which time a portion of the dimethylformamide is distilled off and the remaining solution is poured into lukewarm napthanol.

3.6 g of pure polymer are obtained.

λ_(max) ^(Hexane) = 309 millimicrons K_(sp) = 7,300

EXAMPLE 15

Preparation of a copolymer of vinyloxycarbonylmethyl salicylate/stearyl methacrylate (Process 2 ).

Into a 25 ml flask provided with a condenser, a nitrogen lead in tube and an agitator, there are introduced 2 g of vinyloxycarbonyl-methyl salicylate, 1 g of stearyl methacrylate, 0.3 g of azobis-isobutyronitrile and 3 ml of acetone.

The resulting mixture is heated at reflux for 24 hours after which it is poured into methanol. The resulting precipitate is filtered and then dissolved in chloroform and reprecipitated in methanol, yielding 1.5 g of pure polymer.

λ_(max) ^(CHCl).sbsp.3 = 309 millimicrons K_(sp) = 11,000

EXAMPLE 16

Preparation of a copolymer of vinyloxycarbonylmethyl salicylate dimethylaminoethyl methacrylate quaternized with dimethyl sulfate (Process1).

2 g of vinyloxycarbonyl-methyl salicylate prepared in accordance with Example 12, are copolymerized with 1 g of dimethylaminoethyl methacrylate in solution in 6 g of dioxane in the presence of 0.3 g of azobis-isobutyronitrile.

The solution is agitated for 24 hours at 80° C after which there is introduced 1 g of dimethyl sulfate in solution in 4 g of methanol. The temperature is held for 4 hours at 80° C. The polymer is then precipitated with ethyl acetate, yielding 1 g of pure polymer.

λ_(max) ^(EtOH) - H.sbsp.2O = 304 millimicrons K_(sp) = 11,000

EXAMPLE 17

Preparation of a copolymer of vinyloxycarbonylmethyl flufenate/N-vinylpyrrolidone (Process 1).

a. Preparation of copolymer of N-vinylpyrrolidonevinyl chloroacetate.

Into a 1 liter flask, provided with a condenser filled with solid carbon dioxide, a nitrogen inlet, a dropping funnel and a mechanical agitator, there are introduced 1 g of azobis-isobutyronitrile in solution in 100 g of absolute ethanol, 63.2 g of N-vinylpyrrolidone and 36.8 g of vinyl chloroacetate.

The resulting solution is heated at 80° C for 9 hours with agitation. After 1 hour of the polymerization reaction, the reaction mixture thickens. There are then introduced through the dropping funnel 200 ml of absolute ethanol over a one hour period.

The polymer is obtained under the form of a powder by pouring the ethanolicsolution into sulfuric ether. Then the resulting polymer is redissolved in ethanol and reprecipitated in sulfuric ether, filtered and dried at 40° C under reduced pressure.

Yield = 75%; MW = 40,000 by osmometry in solution in dioxane.

Elementary analysis shows that the copolymer contains 34% vinylchloroacetate and 66% N-vinylpyrrolidone.

b. Preparation of the sodium salt of flufenamic acid.

Into a 1 liter flask provided with a condenser, a dropping funnel and a nitrogen inlet, there are introduced 10.4 g of sodium hydride (58% suspension in oil) and 200 ml of anhydrous dimethylformamide. Then there is slowly introduced, with agitation, a solution of 70.4 g of 3'-trifluoromethyl-2-carboxylic acid diphenylamine (flufenamic acid) in solution in 300 ml of dimethylformamide. At the end of the addition, the temperature is held at 50° C for 1 hour by means of an oil bath. The mixture is then left to cool with the solution being left to stand at rest overnight.

c. Reaction of the sodium salt of flufenamic acid with the copolymer of N-vinylpyrrolidone-vinyl chloroacetate.

110 g of the copolymer, prepared in accordance with paragraph (a) above, are put into solution in 400 g of dimethylformamide. This solution is introduced into the flask containing the solution of the sodium salt of flufenamic acid. The resulting mixture is then heated by an oil bath at 50° C for 24 hours. The reaction product is then poured, little by little, into 5 liters of water. The resulting white precipitate is filtered, dissolved in acetone and precipitated in sulfuric ether. The polymer thus obtained is dried at 40° C under reduced pressure.

Yield: 80%

Viscosity: 2.34 cps

λ_(max) ^(EtOH) = 288 millimicrons K_(sp) = 20,500

Spectrographic content of the polymer in flufenamic acid = 37%.

This polymer can be purified by treating it with an ion exchange resin.

EXAMPLE 18

Preparation of vinyloxycarbonyl-methyl flufenamate of the formula: ##SPC13##

Into a solution of the sodium salt of flufenamic acid, identical to that described in Example 17, paragraph (b), there are slowly introduced 30 g of vinyl chloroacetate diluted with 100 ml of dimethylformamide. The resulting solution is left to stand for 24 hours at ambient temperature with agitation. The mixture is then poured, little by little, into 2 liters of water.

The monomer is isolated under the form of a light yellow powder which is recovered and put into solution in sulfuric ether. The solution is initially washed with N/10 NaOH and then with water until the wash water is neutral. After drying the ether extract on sodium sulfate, the ether isevaporated under reduced pressure, this yielding 60 g of crystalline product which is recrystallized in heptane.

Yield: 66% Melting point: 61° C

λ_(max) 1^(Hexane) = 221 millimicrons

λ_(max) 2^(Hexane) = 285 millimicrons

λ_(max) 3^(Hexane) = 350 millimicrons

EXAMPLE 19

Preparation of a copolymer of vinyloxycarbonylmethyl flufenate/vinyl stearate (Process 2).

1 g of vinyloxycarbonyl-methyl flufenate, obtained in accordance with Example 18, 1 g of vinyl stearate and 0.2 g of azobis-isobutyronitrile aredissolved in 2 g of acetone. The resulting solution is heated for 24 hours at 80° C, left to cool, and then diluted with 4 g of hexane. The solution obtained is then poured, little by little, into 1 liter of absolute ethanol. The resulting polymer precipitates in the form of a powder and is isolated in a conventional manner. There are thus obtained 1.5 g of pure polymer after drying at 40° C under reduced pressure.

λ_(max) ^(EtOH) = 288 millimicrons K_(sp) = 20,000

EXAMPLE 20

Preparation of a homopolymer of vinyloxycarbonylmethyl flufenate.

70 g of vinyloxycarbonyl-methyl flufenate, obtained in accordance with the process of Example 18, and 3.5 g of azobis-isobutyronitrile are dissolved in 70 g of acetone. The resulting solution is heated at 80° C for 18 hours after which there are introduced 3.5 g of additional azobis-isobutyronitrile. The resulting solution is heated for another 24 hours at the same temperature. The solution thus obtained is diluted with 140 ml of acetone, filtered and poured into 2 liters of absolute ethanol. The resulting polymer is recovered in the form of a white powder which is dissolved in 250 ml of dioxane. On its addition to 2 liters of absolute ethanol, previously maintained at 50° C, the polymer precipitates on cooling.

The precipitated polymer is filtered, and then dried under reduced pressure, yielding 58 g of pure polymer.

Molecular weight = 18,500 (by osometry in solution in toluene).

λ_(max) ^(CHCl).sbsp.3 = 288 millimicrons K_(sp) = 35,000

EXAMPLE 21

Preparation of a copolymer of vinyl stearate/vinyloxycarbonyl-methyl 4-methoxy cinnamate/vinyloxycarbonyl-methyl-4-N,N-dimethylamino benzoate/vinyloxycarbonyl-methyl flufenate (Process 1).

Into a 500 ml flask provided with a condenser, a nitrogen lead in tube and an agitator and containing 4.8 g of sodium hydride (50% suspension in oil)and 50 g of dimethylformamide, there are introduced, little by little, 6.8 g of 4-methoxy cinnamic acid, 5 g of 4-N,N-dimethylamino benzoic acid, and8.4 g of flufenamic acid in solution in 50 g of dimethylformamide. The temperature is maintained at 30° C by cooling.

The mixture is stirred overnight at 50° C, after which there are then introduced 40 g of a polymer composed of 70% vinyl stearate and 30% vinylchloroacetate (MW = 40,000) in solution in 100 g of dimethylformamide.

The resulting solution is agitated for 10 hours at 100° C and the polymer is then precipitated in lukewarm water. After filtering, the polymer is dissolved in benzene and precipitated in methanol. The polymer thus obtained is dried under reduced pressure at 40° C.

λ_(max) 1^(CHCl).sbsp.3 = 311 millimicrons K_(sp) = 28,400

λ_(max) 2^(CHCl).sbsp.3 = 300 millimicrons K_(sp) = 26,200

EXAMPLE 22

Preparation of a copolymer of vinyl stearate/vinyloxycarbonyl-methyl 4-methoxy cinnamate/vinyloxycarbonyl-methyl cinnamate/vinyloxycarbonyl-methyl 4-N,N-dimethylamino benzoate (Process 1).

Into a 500 ml flask provided with a condenser, a nitrogen lead in tube and an agitator, and containing 4.8 g of sodium hydride (50% suspension in oil) and 50 g of dimethylformamide, there is introduced, little by solution of 6.8 g of 4-methoxy cinnamic acid, 5 g of 4-N,N-dimethylamino benzoic acid and 4.4 g of cinnamic acid in solution in 50 g of dimethylformamide.

The temperature is maintained at 30° C by cooling. The mixture is then agitated overnight at 50° C, after which there are introduced 40 g of a copolymer composed of 70% vinyl stearate and 30% vinylchloroacetate (MW = 40,000) in solution in 100 g of dimethylformamide.

The solution is agitated for 10 hours at 100° C. The polymer is precipitated in lukewarm water, filtered and then dissolved in benzene. The polymer is precipitated again in methanol and dried at 40° C under reduced pressure.

λ_(max) ^(CHCl).sbsp.3 = 295 millimicrons K_(sp) = 28,600

λ_(max) 2^(CHCl).sbsp.3 = 310 millimicrons K_(sp) = 28,600

EXAMPLE 23

Preparation of a copolymer of stearyl acrylate/3-(acrylamidomethylbenzylidene) DL camphor/vinyloxycarbonyl-methyl-4-N,N-dimethylamino benzoate (Process 1).

a. Into a 250 ml flask provided with a condenser, a nitrogen lead in tube and an agitator, there are introduced 10 g of vinyl chloroacetate, 20 g ofstearyl arcylate, 10 g of 3-(arcylamido methylbenzylidene) DL camphor, 4 g of azobisisobutyronitrile and 80 g of acetone.

The resulting solution is heated with stirring at the reflux of acetone for24 hours. On cooling, a precipitate is formed which is redissolved by the addition thereto of chloroform. The solution is filtered and precipitated in absolute ethanol, yielding 25 g of pure polymer.

λ_(max) ^(CHCl).sbsp.3 = 295 millimicrons K_(sp) = 15,700

b. Into a 100 ml flask, there are introduced 0.48 g of sodium hydride (50% suspension in oil) and 10 g of dimethylformamide. There is then introduced, little by little, a solution of 2 g of 4-N,N-dimethylamino benzoic acid in solution in 10 g of dimethylformamide.

The resulting mixture is left to stand for 24 hours at ambient temperature with stirring.

c. 12 g of the copolymer obtained in accordance with paragraph (a) are dissolved in 36 g of dimethylformamide and the solution is poured into themixture obtained in accordance with paragraph (b). The resulting reaction mixture is heated for 10 hours at 50° C, after which it is precipitated in water. After filtering, the polymer obtained is dried under reduced pressure.

λ_(max) ^(CHCl).sbsp.3 = 299 millimicrons K_(sp) = 20,000

In the preceding examples, the absorbing power of the filter has been defined by means of its K_(sp), which is a function of the quantity of the filtering substance contained in the sample, of the measured optical density and of a constant dependent on the apparatus.

The definition of K_(sp) is given in "Introduction to Electronic Absorption Spectroscopy In Organic Chemistry" by Gillam and Stern, Arnold Ed., London, 1954, p. 10.

K_(specific) = K_(sp) = (K/C)

where K = (d/e) and C = concentration of the solution in g/ml, d = measuredoptical density and e = wave length of the cell of the apparatus in cm.

EXAMPLES OF COSMETIC COMPOSITIONS EXAMPLES 24-28

An anti-solar oil composition in accordance with the present invention is prepared by admixing the following components:

    ______________________________________                                         Polymer of Example 2  10g                                                      Perfume               0.5g                                                     Butylated hydroxytoluene                                                        (antioxidant)        0.0625g                                                  Colza oil, q.s.p.     100g                                                     ______________________________________                                    

The above formulation is repeated except that the polymer of Example 2 is replaced by the same quantity of the polymer prepared according to each ofExamples 3, 8, 14 and 15. A comparatively advantageous anti-solar oil composition results in each instance.

EXAMPLES 29-32

An anti-solar lotion in accordance with the present invention is prepared by admixing the following components:

    ______________________________________                                         Polymer of Example 5   5g                                                      Lanolin                2.5g                                                    Butylated hydroxyanisole                                                        (antioxidant)         0.0625g                                                 Triglycerides of octanoic                                                       and decanoic acids    40g                                                     Ethyl alcohol (96%) q.s.p.                                                                            100g                                                    ______________________________________                                    

The above formulation is repeated except that the polymer of Example 5 is replaced by the same quantity of the polymer prepared according to each ofExamples 9, 10 and 13. A comparably advantageous anti-solar lotion results in each instance.

EXAMPLES 33-38

An anti-solar aerosol formulation is prepared by admixing the following components and packaging the same in an aerosol container under pressure:

    ______________________________________                                         Polymer of Example 8   5g                                                      Absolute ethyl alcohol 30g                                                     Isopropyl myristate    20g                                                     Ricin oil              2g                                                      Lanolin                2g                                                      Perfume                1g                                                      Dichlorodifluoromethane                                                                               40g                                                     ______________________________________                                    

The above aerosol formulation is repeated except that the polymer of Example 8 is replaced by the same quantity of the polymer prepared according to each of Examples 5, 10, 21, 22 and 23. A comparably effectiveanti-solar aerosol composition results in each instance.

EXAMPLES 39-42

An anti-solar aerosol foam composition according to the present invention is prepared by admixing the following components:

    ______________________________________                                         Polymer of Example 13    10g                                                   Stearic acid             0.5g                                                  Lauric acid              0.5g                                                  Palmitic acid            2.5g                                                  Vaseline oil             45.7g                                                 Ethyl p-hydroxybenzoate  0.3g                                                  Triethanolamine          1.5g                                                  Reticulated polyacrylic acid,                                                   known under the trade name                                                     CARBOPOL, (0.05% solution                                                      in H.sub.2 O.sub.2)-carboxypolymethylene                                                               38.5g                                                 Perfume                  0.5g                                                  ______________________________________                                    

87 g of the above composition are packaged under pressure in a conventionalaerosol container or bomb together with 13 g of dichlorodifluoromethane.

The above aerosol formulation is repeated except that the polymer of Example 13 is replaced by the same quantity of the polymer prepared in accordance with each of Examples 14, 15 and 19. A comparably effective anti-solar aerosol foam results in each instance.

EXAMPLES 43-44

An anti-solar cream is prepared in accordance with the present invention byadmixing the following components:

    ______________________________________                                         Polymer of Example 10   10g                                                    Triglycerides of octanoic and                                                   decanoic acids         31g                                                    Glycerol monostearate   6g                                                     Polyethylene glycol stearate                                                                           2g                                                     Stearic acid            2g                                                     Cetyl alcohol           1.2g                                                   Lanolin                 4g                                                     Silicone oil            1g                                                     Methyl p-hydroxybenzoate                                                                               0.3g                                                   Propylene glycol        2g                                                     Triethanolamine         0.1g                                                   Perfume                 0.5g                                                   Water, q.s.p.           100g                                                   ______________________________________                                    

The above anti-solar cream formulation is repeated except that the polymer of Example 10 is replaced by the same quantity of the polymer prepared in accordance with Example 17. A comparably effective anti-solar cream results.

EXAMPLE 45

An anti-solar milk is prepared in accordance with the present invention by admixing the following components:

    ______________________________________                                         Polymer of Example 20   5g                                                     Cetyl-stearyl alcohol   2g                                                     Cetyl alcohol           2g                                                     Vaseline oil            20g                                                    Lanolin                 4g                                                     Stearic acid            0.5g                                                   Silicone oil            0.3g                                                   Propyl p-hydroxybenzoate                                                                               0.4g                                                   Glycerin                5g                                                     Reticulated polyacrylic acid                                                    sold under the trade name                                                      CARBOPOL (carboxypolymethy-                                                    lene)                  0.15g                                                  Triethanolamine         0.20g                                                  Perfume                 0.3g                                                   Water, q.s.p.           100g                                                   ______________________________________                                    

EXAMPLES 46-47

An anti-solar cream formulation in accordance with the present invention isprepared by admixing the following components:

    ______________________________________                                         Polymer of Example 4    15g                                                    Cetyl-stearyl alcohol   2g                                                     Glycerol monostearate   4g                                                     Cetyl alcohol           4g                                                     Vaseline oil            5g                                                     Butyl stearate          5g                                                     Propylene glycol        7g                                                     Silicone oil            0.125g                                                 Non-ionic polymer of high                                                       molecular weight sold under                                                    the trade name POLYOX (5%                                                      solution in H.sub.2 O.sub.2)                                                                          3.5g                                                   Methyl p-hydroxybenzoate                                                                               0.3g                                                   Perfume                 0.4g                                                   Water, q.s.p.           100g                                                   ______________________________________                                    

The above anti-solar cream formulation is repeated except that the polymer of Example 4 is replaced by the same quantity of the polymer prepared in accordance with Example 6. A comparably effective anti-solar cream results.

EXAMPLE 48

An anti-solar milk in accordance with the present invention is prepared by admixing the following components:

    ______________________________________                                         Polymer of Example 11                                                                               5g                                                        Polymer of Example 6 5g                                                        Sipol wax            5g                                                        Vaseline oil         6g                                                        Isopropyl myristate  3g                                                        Propyl p-hydroxybenzoate                                                                            0.3g                                                      Glycerin             20g                                                       Perfume              0.5g                                                      Water, q.s.p.        100g                                                      ______________________________________                                    

EXAMPLE 49

An anti-solar aerosol foam composition in accordance with the present invention is prepared by admixing the following components:

    ______________________________________                                         Polymer of Example 16                                                                               10g                                                       Sipol wax            3.5g                                                      Vaseline oil         6g                                                        Isopropyl myristate  3g                                                        Methyl p-hydroxybenzoate                                                                            0.3g                                                      Glycerin             10g                                                       Perfume              0.3g                                                      Water, q.s.p.        100g                                                      ______________________________________                                    

87 g of the above composition are packaged in a conventional aerosol container under pressure together with 13 g of dichlorodifluoromethane.

EXAMPLE 50

A hair setting lotion for coloring hair is prepared in accordance with the present invention by admixing the following components:

    ______________________________________                                         Copolymer of Example 11 0.3g                                                   Copolymer of vinylpyrrolidone/                                                  vinylacetate, 70/30, M.W. =                                                    40,000                 2g                                                     Ethyl alcohol           50g                                                    Dye - CI Basic Violet 1                                                        (CI 42535)              0.002g                                                 Water, q.s.p.           100g                                                   ______________________________________                                    

EXAMPLE 51

A hair setting lotion for coloring hair is prepared in accordance with the present invention by admixing the following components:

    ______________________________________                                         Copolymer of Example 16  0.3g                                                  Copolymer of crotonic acid/vinyl                                                acetate, 90/10, M.W. = 40,000                                                                          2g                                                    Ethyl alcohol            50g                                                   Triethanolamine, q.s.p.  pH7                                                   Dye - CI Basic Violet 3                                                        (CI 42555)               0.002g                                                Dye - CI Basic Violet 1                                                        (CI 42535)               0.001g                                                Water, q.s.p.            100g                                                  ______________________________________                                     

What is claimed is:
 1. Anti-solar polymer useful in cosmetic applications having in the macromolecular chain a unit of the formula ##EQU2## wherein R is ##SPC14##wherein R₁ and R₂ represent alkyl having 1-3 carbon atoms, said anti-solar polymer being selected from the group consisting of a homopolymer and a copolymer, said copolymer further containing a unit derived from an ethylenically unsaturated monomer and said unit having the structural formula given above being present in an amount between about 10-100 percent of the total weight of the polymer.
 2. Anti-solar polymer which is a homopolymer having in the macromolecular chain thereof units of the formula ##SPC15##wherein R₁ and R₂ represent alkyl having 1-3 carbon atoms, said anti-solar polymer having an average molecular weight between about 2,000 - 1,000,000.
 3. Anti-solar polymer having in the macromolecular chain from 10-100% by weight of units of the formula ##SPC16##wherein R₁ and R₂ represent alkyl having from 1-3 carbon atoms, the remainder comprising units derived from vinyl stearate.
 4. The polymer of claim 3 which further contains a unit of the formula ##SPC17##wherein R₃ represents a member selected from the group consisting of hydrogen and methoxy.
 5. The polymer of claim 4 which contains a unit having the structural formula given in claim 26 wherein R₃ is hydrogen and a unit having the structural formula given in claim 26 wherein R₃ is methoxy.
 6. The polymer of claim 3 wherein the amount of vinyl stearate is about 20-90 percent of the total weight of the polymer.
 7. The polymer of claim 2 wherein R₁ and R₂ represent methyl.
 8. The polymer of claim 1 having an average molecular weight ranging between about 2000-1,000,000.
 9. A process for preparing the anti-solar polymer of claim 1 comprising in a first stage polymerizing with one or more comonomers, a monomer of the formula ##STR8## wherein X is a halogen and in a second stage, reacting the resulting polymer with an alkaline salt of an aromatic compound of the formula ##STR9## wherein R has the meaning given hereinbefore in amounts corresponding to the desired polymer.
 10. A process for preparing the anti-solar polymer of claim 1 comprising in a first stage preparing a compound of the formula ##STR10## wherein R has the meaning given hereinbefore and in a second stage, polymerizing the resulting compound with one or more comonomers, in amounts corresponding to the desired polymer.
 11. The process of claim 10 wherein said polymerization is effected with a catalyst present in amounts between 0.2-35 percent of the total weight of the monomers.
 12. The process of claim 10 wherein said catalyst is present in amounts of 0.5-20 percent of the total weight of monomers.
 13. The polymer of claim 5 which is a copolymer of vinyl stearate/vinyloxycarbonyl-methyl 4-methoxy cinnamate/vinyloxycarbonylmethyl cinnamate/vinyloxycarbonyl-methyl 4-N,N-dimethylamino benzoate. 